• These BD Micro-Fine Plus Penta Point Needles, with a size of 31G x 5mm , are designed with optimal point geometry for maximum comfort and reliability. They feature a Micro-Bonded lubrication coating for a more comfortable injection and are made from a special surgical grade of stainless steel. These needles are the smallest and thinnest insulin pen needles in the world, measuring 5mm. Additionally, they are non-toxic, non-pyrogenic, and do not contain latex.